'Keystoning' is a form of video image distortion that occurs with front projectors if the centerline of the projector's lens is not perpendicular to the screen. Keystoning results in an image which is shaped like a trapezoid rather than a rectangle — the top of the picture is wider than the bottom, or the left side is taller than the right, for e...
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http://www.crutchfield.com/S-np170FLGK7y/learn/learningcenter/home/tv_gloss
When a projector is not positioned at the centre of the screen, the image is projected at an angle and may appear distorted. Keystone Correction automatically adjusts for this distortion. With Sony Side Shotâ„¢ horizontal Keystone Correction, you can place the projector off-axis from the centre of the screen when needed. Plug it in, turn it on ...
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http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
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